<!DOCTYPE html>
<html>
<head>
<style type="text/css" media="screen">
.subpixelPusher {
    position: relative;
    top: 0.4px;
}
.container {
    display: inline-block;
}
</style>
<script src="../../resources/run-after-layout-and-paint.js" type="text/javascript"></script>
<script>
if (window.testRunner)
  testRunner.waitUntilDone();

function setupIframes() {
  setupIframe(document.getElementById('iframe1').contentWindow.document);
  setupIframe(document.getElementById('iframe2').contentWindow.document);
  document.getElementById('iframe1').contentWindow.scrollTo(0, 10);
}

function setupIframe(iframe) {
  iframe.open('text/html', 'replace');
  iframe.write("<!DOCTYPE html>\n<html><body style=\"background-color: silver;height: 1000px;\"></body>");
  iframe.close();
}

function repaintTest() {
  document.getElementById('iframe1').contentWindow.scrollTo(0, 0);
  document.getElementById('iframe2').contentWindow.scrollTo(0, 10);
  if (window.testRunner)
    testRunner.notifyDone();
}
</script>
</head>
<body onload="setupIframes();runAfterLayoutAndPaint(repaintTest);">
  <p>The iframes below should remain grey with no repaint artifacts when scrolling.</p>
  <div>
    <div class="container">
      <div class="subpixelPusher">
        <div class="subpixelPusher">
        <iframe id="iframe1"  style="width: 150px; height: 200px;"></iframe>
      </div>
      </div>
    </div>
    <div class="container">
      <div class="subpixelPusher">
        <div class="subpixelPusher">
          <iframe id="iframe2"  style="width: 150px; height: 200px;"></iframe>
        </div>
      </div>
    </div>
  </div>
</body>
</html>
